The values for the curr change reason can be found here:
https://wiki.esoui.com/Globals#CurrencyChangeReason
If I watch the reasons there I think off them only as constant values but NO text. I guess there is no text. Or you could look if you find something here:
https://github.com/esoui/esoui/tree/...melocalization
https://github.com/esoui/esoui/tree/...melocalization
Check the lua files for SI_* constants which might match the reasons. You can get the string by using function GetString(SI*) constant then.